Yumiao Ma

Solid Superacid-catalyzed Hydroconversion of Demineralized Shengli Coal Liquefaction Residue under Microwave Irradiation

Abstract Shengli coal liquefaction residue was demineralized; the demineralized Shengli coal liquefaction residue (DMSCLR) was then subject to non-catalytic and SO4 2−/ZrO2- or SO4 2−/TiO2-catalyzed hydroconversion in methanol under microwave irradiation. The results show that both, SO4 2−/ZrO2 and SO4 2−/TiO2, significantly catalyzed DMSCLR hydroconversion. The MESs of hydrogenated DMSCLR were analyzed with gas chromatography/mass spectrometer. The MESs and methanol-inextractable fractions of hydrogenated DMSCLR were characterized with Fourier transform infrared spectrometer.

The Microwave-assisted Hydrogenation of 9,10-Diphenylanthracene over Pd/C

Abstract Palladium/activated carbon (Pd/C) catalyzed hydrogenation of 9,10-diphenylanthracene (DPA), used as a coal-related model compound, was investigated under microwave irradiation. The effects of reaction temperature, pressure, and time on DPA yield were studied. The results show that DPA hydrogenation proceeds at much lower temperatures and hydrogen pressure under microwave irradiation than those by conventional heating and Pd/C mainly promote ipso hydrogenation of DPA. The related mechanism was discussed.

GC/MS Analysis of the Products from Supercritical Methanolysis of Rice-stalk Powder

Abstract Rice-stalk powder was heated in supercritical methanol at 300°C and the resulting products were analyzed with gas chromatography/mass spectrometer (GC/MS). After the supercritical methanolysis, more than 89% of organic mater in the rice-stalk powder was converted to methanol-soluble species, in which more than 100 organic compounds were detected and most of them are oxygen-containing ones, including ketones, hydroxybenzenes, esters, methoxyaromatics, aldehydes, alkanols, and carboxylic acids. Other species detected are alkanes, alkenes, arenes, and nitrogen- and sulfur-containing organic compounds.

Catalytic hydroconversion of oxydibenzene to cyclohexane over bifunctional Ni/Hβ

ABSTRACT An active bifunctional Ni/Hβ was prepared by decomposing Ni(CO)4 to dispersive metallic Ni onto Hβ and applied in hydroconversion of oxydibenzene (ODB), which was used as a model reaction for the catalytic hydroconversion (CHC) of lignin or lignin oligomers to hydrocarbon fuels. The effects of reaction temperature, initial H2 pressure (IHP), and reaction time on the CHC of ODB was studied. Ni/Hβ was found to be effective for converting ODB into cyclohexane at 200°C under higher IHP. The mechanism for the CHC of ODB was discussed and the difference in mechanism under lower and higher IHP can be ascribed to the hydrogen-accepting abilities of unsaturated hydrocarbon products.

Effect of Microwave Irradiation on a Mo-based Catalyst for CO Hydrogenation

Abstract A Mo-based catalyst (catalyst I) was prepared under microwave irradiation, and characterized with X-ray diffractometer, X-ray fluorescence spectrometry, nitrogen adsorption, Fourier transform infrared spectrometer, and scanning electron microscope. The activity of catalyst I for CO hydrogenation was studied in comparison with another Mo-based catalyst (catalyst II) prepared by conventional heating methods. The results show that CO conversion reached a maximum with temperatures up to 240°C over either of the catalysts. However, CO conversion and selectivities of methanol and dimethyl ether over catalyst I were higher than those over catalyst II, indicating that microwave irradiation favors the preparation of Mo-based catalyst for CO hydrogenation catalyst.